Statement of Consolidated Shareholders' Deficit (Unaudited) - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Capital Surplus	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock, At Cost
Beginning balance at Dec. 31, 2018	$ (305.5)	$ 0.0	$ 0.3	$ 2,327.6	$ (2,208.4)	$ (332.3)	$ (92.7)
Equity-based compensation	1.6	0.0		1.6
Net income (loss)	(49.1)	0.0			(49.1)
Amortization of prior net losses	3.2	0.0				3.2
Amortization of prior service credit	(0.1)	0.0				(0.1)
Foreign currency translation adjustments	0.4	0.0				0.4
Ending balance at Mar. 31, 2019	(349.5)	0.0	0.3	2,329.2	(2,257.5)	(328.8)	(92.7)
Beginning balance at Dec. 31, 2018	(305.5)	0.0	0.3	2,327.6	(2,208.4)	(332.3)	(92.7)
Net income (loss)	(72.7)
Ending balance at Jun. 30, 2019	(370.1)	0.0	0.3	2,330.2	(2,281.1)	(326.8)	(92.7)
Beginning balance at Mar. 31, 2019	(349.5)	0.0	0.3	2,329.2	(2,257.5)	(328.8)	(92.7)
Equity-based compensation	1.0	0.0		1.0
Net income (loss)	(23.6)	0.0			(23.6)
Amortization of prior net losses	1.6	0.0				1.6
Amortization of prior service credit	(0.1)	0.0				(0.1)
Foreign currency translation adjustments	0.5	0.0				0.5
Ending balance at Jun. 30, 2019	(370.1)	0.0	0.3	2,330.2	(2,281.1)	(326.8)	(92.7)
Beginning balance at Dec. 31, 2019	(441.2)	0.0	0.3	2,332.9	(2,312.4)	(369.3)	(92.7)
Equity-based compensation	1.8	0.0		1.8
Net income (loss)	4.3	0.0			4.3
Amortization of prior net losses	3.3	0.0				3.3
Amortization of prior service credit	(0.1)	0.0				(0.1)
Foreign currency translation adjustments	(1.9)	0.0				(1.9)
Ending balance at Mar. 31, 2020	(433.8)	0.0	0.3	2,334.7	(2,308.1)	(368.0)	(92.7)
Beginning balance at Dec. 31, 2019	(441.2)	0.0	0.3	2,332.9	(2,312.4)	(369.3)	(92.7)
Net income (loss)	(32.8)
Ending balance at Jun. 30, 2020	(466.9)	0.0	0.3	2,335.5	(2,345.2)	(364.8)	(92.7)
Beginning balance at Mar. 31, 2020	(433.8)	0.0	0.3	2,334.7	(2,308.1)	(368.0)	(92.7)
Equity-based compensation	0.8	0.0		0.8
Net income (loss)	(37.1)	0.0			(37.1)
Amortization of prior net losses	2.4	0.0				2.4
Amortization of prior service credit	(0.1)	0.0				(0.1)
Foreign currency translation adjustments	0.9	0.0				0.9
Ending balance at Jun. 30, 2020	$ (466.9)	$ 0.0	$ 0.3	$ 2,335.5	$ (2,345.2)	$ (364.8)	$ (92.7)